Space & fit
Measure your counter and everyday dishes
Check the body, its required ventilation space and your largest everyday dish separately. A microwave can pass one of those checks and fail another. Keep a short measurement note before comparing models, so “compact” and “family size” become decisions you can verify.
Start with the place where it will operate
Measure a clear, stable section of counter. Record the available width, usable depth and height below anything overhead. Include objects that stay in place: a side wall, a cabinet edge, a backsplash or another appliance. A long counter is not fully usable if the microwave's door would hit something or its vents would sit against an obstruction.
Do not use the shipping-carton dimensions. On a manufacturer specification sheet, find the oven's exterior measurements and their labeled order. Panasonic's NN-SN67KS specification page, for example, distinguishes outside size from cavity size and from the cabinet opening required by its compatible trim arrangement. These are three different measurements.
Leave the space the exact manual requires
The machine's width is only its body width. The installation envelope includes any required clear space around it. Open the installation section for the complete model code and market, rather than copying a clearance from a superficially similar microwave.
As a specific example, the NN-SN686S/NN-SN67HS owner manual calls for three inches at both sides and one inch above, alongside other placement requirements. That example does not set a universal clearance for Panasonic or other brands. Its purpose is to show why a body-only comparison can approve a space that the actual instructions do not.
Measure the dish you want to keep using
For a round dinner plate, measure across its widest point. For a rectangular container, record width and length, including handles. Include a microwave-safe cover if it normally stays on during heating. A bowl's height matters too, particularly when you need room to hold it securely during removal.
A turntable diameter is a useful first check for round dishes. It does not, by itself, prove that a rectangular dish can rotate freely or pass through the door comfortably. If the dish is the deciding requirement, obtain the cavity and opening details or check the actual appliance with the seller. Avoid turning “1.2 cubic feet” into a made-up maximum plate diameter.
Check the movement, not just the closed box
Picture loading a filled dish from the position where you stand. The door must open far enough, and you need a practical route for placing and removing that dish. A countertop corner can make that movement less convenient even when the closed microwave fits. Make sure the controls remain reachable and readable in the intended position.
Check the manufacturer's instructions for the electrical connection and cord placement as part of installation. Do not move the appliance into an unsuitable position simply to make a short cord reach. If the prescribed connection is unavailable, settle that installation question before choosing a model.
Use a separate decision for a cabinet
An open-looking shelf is not automatically an approved countertop location. A built-in installation requires explicit support for that oven and the prescribed kit or installation method. Panasonic's NN-TK621SS page names compatible models and a cutout size; it does not authorize fitting any similarly sized microwave behind a decorative frame.
Keep this note beside your shortlist
- Available operating area: width, depth and height.
- Exact model body dimensions, with axis labels.
- Manual-required clearances and installation type.
- Largest everyday dish, including handles and cover.
- Door access, control access and the prescribed electrical connection.
When one item is unknown, keep it as a purchasing question. Do not count an unknown opening dimension as a successful dish-fit check. That small distinction prevents a confident-looking recommendation from overlooking the thing you needed the microwave to do.